Towel rack



FIG. 1 is a front elevation view of a towel rack showing my new design;

FIG. 2 is top view of the towel rack;

FIG. 3 is a left side view of the towel rack;

FIG. 4 is a right side view of the towel rack;

FIG. 5 is a back view of the towel rack; and,

FIG. 6 is a perspective view of the towel rack. 

The ornamental design for a towel rack, as shown and described. 